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Osabe Shunjirō (長部 瞬二郎; 28 May 1932 – 12 October 2026), better known by the pen name of Kuroi Senji (黒井 千次), was a Japanese author of fiction and essays.
Senji was a member of the "Introspective Generation" of Japanese writers, whose work depicts the thoughts of ordinary Japanese. He lived in Tokyo's western suburbs, along the Chūō Main Line, in a neighborhood similar to that depicted in his novel of linked stories, Gunsei (Life in the Cul-de-Sac, 群棲), for which he won the 1984 Tanizaki Prize.
As of 2006 he was president of the Japan Writer's Association (Nihon Bungeika Kyokai).
Senji died from pneumonia on 12 October 2026, at the age of 94.